Arcane Forging allows you to repair items with a certain change of maintainging its enchantments. The enchantments may be kept at their existing levels, downgraded to a lower level or list entirely.
How efficient this skill is depends on your rank/level:

Super Repair is a passive ability. When repairing an item it grants players a change to repair with double effectiveness. The likelyhood of this happening starts at 40% at level 40 (400) and it increases by 1% every level (10 levels) to 100% at level 100 (1000).